diff --git a/src/sbbs3/install/GNUmakefile b/src/sbbs3/install/GNUmakefile
index c7148613fa5762319a405bad3c01651ab69b0292..15e572e87c59cb44af41137ef885baef88c36e60 100644
--- a/src/sbbs3/install/GNUmakefile
+++ b/src/sbbs3/install/GNUmakefile
@@ -35,7 +35,7 @@ DELETE	=	rm -f -v
 OUTLIB	=	-o
 
 CFLAGS	+=	-O2
-CFLAGS	+=	-Wall -I$(UIFC) -I$(XPDEV) -I..
+CFLAGS	+=	-MMD -Wall -I$(UIFC) -I$(XPDEV) -I..
 
 LFLAGS	:=	-static -L/usr/local/lib